CN102155234A - Excavation construction method for unsymmetrical small-space tunnel - Google Patents
Excavation construction method for unsymmetrical small-space tunnel Download PDFInfo
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- CN102155234A CN102155234A CN2011100877984A CN201110087798A CN102155234A CN 102155234 A CN102155234 A CN 102155234A CN 2011100877984 A CN2011100877984 A CN 2011100877984A CN 201110087798 A CN201110087798 A CN 201110087798A CN 102155234 A CN102155234 A CN 102155234A
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Abstract
The invention relates to a construction method for an unsymmetrical big-span and small-span subway tunnel, namely an excavation construction method for an unsymmetrical small-space tunnel. The excavation construction method comprises the following steps: firstly, excavating a small-span tunnel; putting an anchor rod in a clamped rock between a big-span tunnel and the small-span tunnel before the primary support of the small-span tunnel is manufactured, wherein the anchor rod has the functions of grouting and oppositely pulling; then manufacturing the primary support of the small-span tunnel; welding one end of the anchor rod with the primary support of the small-span tunnel; excavating the big-span tunnel by steps after the secondary lining of the small-span tunnel is manufactured; firstly excavating one side close to the small-span tunnel; processing and welding the other end of the anchor rod to the primary support of the big-span tunnel to form the oppositely pulling anchor rod; excavating the big-span tunnel by steps; and manufacturing secondary tunnel linings. In the excavation construction method, the clamped rock stability for excavating the small-span tunnel and the space effect of surrounding rock stress variation are considered, the oppositely pulling grouting anchor rod is used for reinforcing the clamped rock; the excavation sequence of firstly excavating the small-span tunnel and then excavating the big-span tunnel is cooperated; and the effects on stabilizing the clamped rock and controlling the support structure of the tunnel and ground sedimentation are obvious.
Description
Technical field
The present invention relates to a kind of the application and the tunnel excavation job practices in city underground engineering field, be specifically related to a kind of asymmetrical little spacing tunnel excavation job practices.
Background technology
The city underground tunnel is influenced by landform, circuit route selection etc., the tunnel cross-section variation is frequent and increasingly sophisticated, asymmetrical little spacing tunnel cross-section is also more and more, and asymmetric bore tunnel mainly is the different tunnel of span, for example the little spacing tunnel of single-track tunnel and double track tunnel composition.Asymmetrical little spacing tunnel excavation subject matter is the ground relative settlement problem that the stable and tunnel structure unbalance stress of therebetween rock causes in the digging process.Complicated and for city underground tunnel surrounding buildings thing and pipeline in addition to the relative settlement sensitivity, therefore be necessary reasonably to press from both sides rock, structural strengthening measure and select the reasonable excavation order.
The general employing of tunnel excavation under little spacing condition adopted whole grouting and reinforcings or set bolt support the folder rock.For setting anchor pole in zone of fracture that has the crack and the weak soil layer country rock strength is improved not quite, it is limited in one's ability to the control relative settlement.Can increase the globality of folder rock under the slip casting condition, but limited for the bias voltage globality effect in the excavation of asymmetric tunnel cross-section, can not improve the globality between cavern's structure, therefore limited to the effects such as relative settlement that reduce the tunnel.In asymmetric bore tunnel sequence of excavation, excavation narrow-bore tunnel, back is bigger to the large cross-section tunnel surrouding rock stress distribution influence of excavating earlier, causes the main stress bar anglec of rotation big, thereby is unfavorable for structure stress, because it is the mistake distance of the first relatively tunneling of back excavation is longer, unfavorable simultaneously to the reduction of erection time.
The little spacing tunnel that large and small span tunnel is formed, its excavation method be in the middle of being subjected to rock pillar thickness to influence difference bigger, reduce surface settlement simultaneously for the influence that reduces the surrounding buildings thing generally speaking, the construction longspan tunnels earlier that adopt more, the little span of constructing then tunnel measure such as suitably reinforces to the center pillar country rock simultaneously.
Summary of the invention
Purpose of the present invention is at the weak point of above-mentioned research, a kind of excavation construction method at asymmetrical little spacing tunnel has been proposed, excavate longspan tunnel earlier, it is big to perform forward direction in the tunnel preliminary bracing of little span, little span tunnel therebetween rock sets anchor pole, anchor pole has slip casting concurrently and to drawing function, perform the preliminary bracing in little span tunnel then, and with the preliminary bracing in anchor pole one end and little span tunnel welding, step excavation longspan tunnel after little span tunnel double-lining performs and finishes, excavation is near little span tunnel one side earlier, and in that being handled, the other end of anchor pole is welded in the preliminary bracing of longspan tunnel, formation distributes then and excavates longspan tunnel and perform secondary lining drawing anchor pole.
The realization of the object of the invention is finished by following technical scheme:
A kind of asymmetrical little spacing tunnel excavation job practices, comprise large and small span tunnel excavation order, center pillar surrounding rock consolidation, the measure of large and small span tunnel structure Deformation control, it is characterized in that described large and small span tunnel excavation is in proper order for excavating little span tunnel earlier, back excavation longspan tunnel, but and behind little span tunnel excavation, perform hollow grouted anchor bar and slip casting, described anchor pole just props up structure welding back in large and small span and forms drawing.
Described asymmetric little spacing tunnel is more than or equal to 1.0 for span ratio, and the tunnel spacing is less than footpath, hole, 2.0 times of little span tunnels.Sequence of excavation is to excavate little span tunnel (relatively) earlier, back excavation longspan tunnel.Described large and small span tunnel excavation scheme can be selected different excavation plan for use with the tunnel span according to grade.
Described anchor pole is a hollow grouting anchor, and anchor pole sets length and is as the criterion to invade adjacent tunnel outline line 30cm.Anchor pole set before performing preliminary bracing behind the little span tunnel excavation, set to finish the grouting behind shaft or drift lining sealing, when performing little spacing tunnel the grouted anchor bar redundance was cut off, and was soldered on the first structure.Described grouted anchor bar is evenly arranged in center pillar folder rock, grouting and reinforcing region overlapping 25% in the layout scope.
Described longspan tunnel will just prop up structure when excavating excavation value grouted anchor bar side and anchor pole is welded into whole the composition drawing anchor pole.
The wrong distance of described excavation and support is carried out, and little span tunnel cross-section excavation sets footpath, 1 times of Dan Dong hole prior to anchor pole, prior to footpath, 3-4 times of Dan Dong hole of two lining supportings; Longspan tunnel rises to back excavation more than 60% at little span tunnel double-lining supporting intensity, and excavation is near the Dan Dong hole footpath of folder rock side single excavation cyclic advance less than 1 times of longspan tunnel earlier.
Advantage of the present invention is: the present invention is absorbed in the globality of the stable and tunnel surrounding of little spacing tunnel folder rock, supporting and protection structure, have the remarks slurry concurrently and the slip casting of drawing effect is pressed from both sides stable, the firm interlock between rock, the Grouting Pipe to drawing anchor pole formation tunnel support, center pillar by use, not only improve surrounding rock stability, and large and small span tunnel lining globality is strengthened, overcome the influence of bias voltage.The present invention simultaneously adopts the elder generation little span of construction tunnel, back construction longspan tunnel, and the little span tunnel of constructing earlier, its soil excavation and supporting and protection structure are simple, make construction speed very fast, and wrong distance apart from excavation is shorter, can the reduction of erection time.
Description of drawings
Fig. 1 is tunnel support and anchor pole interaction schematic diagram;
Fig. 2 is that the tunnel is wrong apart from the excavation schematic diagram;
Fig. 3 is a bolt grouting effect schematic diagram.
The specific embodiment
The little spacing tunnel of forming with single line and double track tunnel is the example description of drawings, wherein single-track tunnel adopts two benching tunnelling methods excavation up and down, double track tunnel adopts four excavations of two steps, utility model feature and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
As Figure 1-3, label is represented respectively: little span tunnel support 1, slip casting tension, to drawing anchor pole 2, grouting and reinforcing rock stratum 3, longspan tunnel preliminary bracing 4, little span tunnel excavation temporary lining 5, the temporary lining 6 of longspan tunnel excavation; Top, little span tunnel excavation
, bottom, little span tunnel excavation II, four excavations of longspan tunnel III, IV, V, VI.
A kind of asymmetrical little spacing tunnel excavation job practices, its concrete working procedure excavates little span tunnel for adopting earlier the up/down steps method, performs hollow bolt before just performing, and grouting and reinforcing, preliminary bracing performs the back and anchor pole one end is welded into integral body, performs Tunnel Second Lining.Longspan tunnel adopts four methods of two steps to carry out, excavation top is near center pillar country rock part earlier, excavate the upper right soil body then, next excavate the bottom, left side, excavate the lower right side soil body at last, be welded in the longspan tunnel preliminary bracing after the anchor pole that excavates outline line is handled invading near center pillar country rock side excavation back, perform tunnel double-lining then.
Figure 1 shows that tunnel support and anchor pole interaction schematic diagram, slip casting becomes integral body to coming anchor pole that the preliminary bracing in big or small span tunnel is adopted to be rigidly connected, folder rock between the tunnel improves intensity by slip casting, and the distortion that excavation causes reduces, and becomes integral body with anchor pole.
Figure 2 shows that the tunnel is wrong apart from the excavation schematic diagram, top, little span tunnel excavation is footpath, 2 times of Dan Dong holes of bottom excavation in advance, grouted anchor bar performs and handles prior to just propping up a structure and performs, footpath, 1 times of hole of hysteresis excavation face, and the supporting of little span tunnel double-lining performs and lags behind 1 times of hole of a first structure directly; For longspan tunnel III portion, the wrong distance excavation of IV portion, wrong apart from being footpath, 1 times of Dan Dong hole, wherein III portion carries out after little span tunnel double-lining intensity grows to 65%, V portion excavation lags behind the footpath, 2 times of holes of topping bar, mistake between V portion and the VI portion is apart from being footpath, 1 times of hole, and this part grouted anchor bar performs and handles prior to just propping up a structure and performs.
Figure 3 shows that bolt grouting effect schematic diagram, grouted anchor bar arranges that evenly the slip casting lap is 45% of a slip casting radius.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (6)
1. asymmetrical little spacing tunnel excavation job practices, comprise large and small span tunnel excavation order, center pillar surrounding rock consolidation, the measure of large and small span tunnel structure Deformation control, it is characterized in that described large and small span tunnel excavation is in proper order for excavating little span tunnel earlier, back excavation longspan tunnel, but and behind little span tunnel excavation, perform hollow grouted anchor bar and slip casting, described anchor pole just props up structure welding back in large and small span and forms drawing.
2. a kind of asymmetrical little spacing tunnel excavation job practices according to claim 1, it is characterized in that described asymmetric little spacing tunnel is more than or equal to 1.0 for span ratio, the tunnel spacing is less than footpath, hole, 2.0 times of little span tunnels, sequence of excavation is to excavate little span tunnel (relatively) earlier, back excavation longspan tunnel, described large and small span tunnel excavation scheme can be selected different excavation plan for use with the tunnel span according to grade.
3. a kind of asymmetrical little spacing tunnel excavation job practices according to claim 1 is characterized in that described anchor pole is a hollow grouting anchor, and anchor pole sets length and is as the criterion to invade adjacent tunnel outline line 30cm.
4. a kind of asymmetrical little spacing tunnel excavation job practices according to claim 3, it is characterized in that described anchor pole set before performing preliminary bracing behind the little span tunnel excavation, set and finish the grouting behind shaft or drift lining sealing, when performing little spacing tunnel the grouted anchor bar redundance is cut off, and be soldered on the first structure, described grouted anchor bar is evenly arranged in center pillar folder rock, grouting and reinforcing region overlapping 25% in the layout scope.
5. a kind of asymmetrical little spacing tunnel excavation job practices according to claim 1 is characterized in that described longspan tunnel will just prop up structure when excavating excavation value grouted anchor bar side and anchor pole is welded into whole the composition drawing anchor pole.
6. a kind of asymmetrical little spacing tunnel excavation job practices according to claim 1 is characterized in that described excavation and support is wrong apart from carrying out, and little span tunnel cross-section excavation sets footpath, 1 times of Dan Dong hole prior to anchor pole, prior to footpath, 3-4 times of Dan Dong hole of two lining supportings; Longspan tunnel rises to back excavation more than 60% at little span tunnel double-lining supporting intensity, and excavation is near the Dan Dong hole footpath of folder rock side single excavation cyclic advance less than 1 times of longspan tunnel earlier.
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102966360A (en) * | 2012-11-26 | 2013-03-13 | 中铁四局集团第二工程有限公司 | Method for reinforcing rock walls in neighborhood tunnel |
CN106050240A (en) * | 2016-05-11 | 2016-10-26 | 上海交通大学 | Stability control method for mountainous area weak surrounding rock small-distance tunnel mid-adjacent rock |
CN108979676A (en) * | 2018-09-13 | 2018-12-11 | 中国建筑土木建设有限公司 | A kind of small interval overlapping tunnel folder rock ruggedized construction and its construction method |
CN109184700A (en) * | 2018-08-29 | 2019-01-11 | 中交二公局萌兴工程有限公司 | The construction method of rock is pressed from both sides during a kind of weak surrounding rock small-clear-distance tunnel is stable |
CN109356592A (en) * | 2018-09-30 | 2019-02-19 | 中国建筑第八工程局有限公司 | The construction method in small interval lamination tunnel |
CN109487798A (en) * | 2018-12-29 | 2019-03-19 | 中交(广州)建设有限公司 | Station asymmetry excavation supporting structure and construction technology |
CN110130925A (en) * | 2019-05-17 | 2019-08-16 | 深圳市综合交通设计研究院有限公司 | The composite reinforcing method of rock pillar in a kind of small interval city tunnel |
CN110284900A (en) * | 2019-06-25 | 2019-09-27 | 深圳市综合交通设计研究院有限公司 | A kind of extra small clear distance city tunnel supporting construction of broken formation and its job-hopping construction technology |
CN110318772A (en) * | 2019-08-05 | 2019-10-11 | 西安建筑科技大学 | Canal in Loess Area is greatly across the asymmetric bore tunnel supporting construction of small interval and construction method |
CN112065479A (en) * | 2020-09-14 | 2020-12-11 | 中国建筑第八工程局有限公司 | Construction method of asymmetric multi-curve double-arch tunnel |
CN113266371A (en) * | 2021-06-15 | 2021-08-17 | 中交二公局萌兴工程有限公司 | Rock clamping fixing structure in weak surrounding rock small-clear-distance tunnel and construction method thereof |
CN113847069A (en) * | 2021-10-09 | 2021-12-28 | 北京城建设计发展集团股份有限公司 | Underground excavation subway station of suspension type station hall layer and independent rail traveling area and construction method thereof |
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Cited By (18)
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CN102966360A (en) * | 2012-11-26 | 2013-03-13 | 中铁四局集团第二工程有限公司 | Method for reinforcing rock walls in neighborhood tunnel |
CN106050240A (en) * | 2016-05-11 | 2016-10-26 | 上海交通大学 | Stability control method for mountainous area weak surrounding rock small-distance tunnel mid-adjacent rock |
CN106050240B (en) * | 2016-05-11 | 2019-05-24 | 上海交通大学 | Mountain area weak surrounding rock Shared Rock of Neighborhood Tunnel stability control method |
CN109184700A (en) * | 2018-08-29 | 2019-01-11 | 中交二公局萌兴工程有限公司 | The construction method of rock is pressed from both sides during a kind of weak surrounding rock small-clear-distance tunnel is stable |
CN109184700B (en) * | 2018-08-29 | 2020-01-03 | 中交二公局萌兴工程有限公司 | Construction method for clamping rock in soft surrounding rock small-clear-distance tunnel stability |
CN108979676A (en) * | 2018-09-13 | 2018-12-11 | 中国建筑土木建设有限公司 | A kind of small interval overlapping tunnel folder rock ruggedized construction and its construction method |
CN108979676B (en) * | 2018-09-13 | 2024-03-26 | 中国建筑土木建设有限公司 | Small-clear-distance overlapped tunnel rock clamping reinforcing structure and construction method thereof |
CN109356592A (en) * | 2018-09-30 | 2019-02-19 | 中国建筑第八工程局有限公司 | The construction method in small interval lamination tunnel |
CN109356592B (en) * | 2018-09-30 | 2020-03-20 | 中国建筑第八工程局有限公司 | Construction method of small-clear-distance laminated tunnel |
CN109487798B (en) * | 2018-12-29 | 2024-03-22 | 中交(广州)建设有限公司 | Asymmetric excavation construction process for station |
CN109487798A (en) * | 2018-12-29 | 2019-03-19 | 中交(广州)建设有限公司 | Station asymmetry excavation supporting structure and construction technology |
CN110130925A (en) * | 2019-05-17 | 2019-08-16 | 深圳市综合交通设计研究院有限公司 | The composite reinforcing method of rock pillar in a kind of small interval city tunnel |
CN110284900A (en) * | 2019-06-25 | 2019-09-27 | 深圳市综合交通设计研究院有限公司 | A kind of extra small clear distance city tunnel supporting construction of broken formation and its job-hopping construction technology |
CN110318772A (en) * | 2019-08-05 | 2019-10-11 | 西安建筑科技大学 | Canal in Loess Area is greatly across the asymmetric bore tunnel supporting construction of small interval and construction method |
CN112065479B (en) * | 2020-09-14 | 2022-06-28 | 中国建筑第八工程局有限公司 | Construction method of asymmetric multi-curve double-arch tunnel |
CN112065479A (en) * | 2020-09-14 | 2020-12-11 | 中国建筑第八工程局有限公司 | Construction method of asymmetric multi-curve double-arch tunnel |
CN113266371A (en) * | 2021-06-15 | 2021-08-17 | 中交二公局萌兴工程有限公司 | Rock clamping fixing structure in weak surrounding rock small-clear-distance tunnel and construction method thereof |
CN113847069A (en) * | 2021-10-09 | 2021-12-28 | 北京城建设计发展集团股份有限公司 | Underground excavation subway station of suspension type station hall layer and independent rail traveling area and construction method thereof |
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